Sidelink Feedback Timing Correction in 5G Wireless Systems
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Solution Overview
Problem
In wireless communication systems, particularly in 5G networks, there is a challenge in synchronizing the transmission timing of user equipment (UE) with the base station (BS) for sidelink feedback, leading to ambiguity in feedback transmission timing due to mismatches in synchronization between the BS and UE sidelink synchronization.
Innovation Solution
A method where the UE determines a slot for transmitting physical uplink control channel (PUCCH) based on the number of slots from the physical sidelink feedback channel (PSFCH) to the PUCCH, correcting for the synchronization difference between the PUCCH and PSFCH slots, ensuring accurate timing for feedback transmission to the BS.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE transmits sidelink feedback to the base station without correcting for synchronization differences, then the transmission process is simple, but the feedback transmission timing becomes ambiguous and unreliable
Solution Approach 1:
The UE performs preliminary synchronization adjustment by determining the slot offset between PUCCH and PSFCH before transmitting feedback. The UE calculates the timing offset based on synchronization differences and pre-adjusts the PUCCH transmission timing, ensuring that feedback is transmitted at the correct time without requiring complex real-time synchronization corrections during the feedback transmission process.
2Measurement precision
If the UE adjusts transmission timing to maintain synchronization accuracy, then timing precision is improved, but the complexity of timing determination increases
Solution Approach 1:
The UE uses the slot offset between PUCCH and PSFCH as an intermediary parameter to manage synchronization. Instead of directly calculating and adjusting for all synchronization differences, the UE determines the timing relationship through the intermediate slot offset, which simplifies the synchronization management process while maintaining precise timing alignment between uplink and sidelink transmissions.
Data Source
AI summary
A method for performing an operation for a first terminal in a wireless communication system, in one embodiment, comprises the steps of: determining, by the first terminal, a slot that is to transmit a physical uplink control channel (PUCCH), on the basis of a value for indicating the number of slots from a physical sidelink feedback channel (PSFCH) to the PUCCH; and transmitting, by the first terminal, PSFCH-based feedback information in the slot through the PUCCH to a base station, wherein the value for indicating, on the basis the slot for the PUCCH and the slot for the PSFCH not being synchronized with each other, the number of slots is a value corrected by the first terminal on the basis of a synchronization difference between the slot for the PUCCH and the slot for the PSFCH.